Steel cable barriers in highway medians are a lowcostway
Chapter 7, Problem 7.18(choose chapter or problem)
Steel cable barriers in highway medians are a lowcostway to improve traffic safety without overstressingdepartment of transportation budgets.Cable barriers cost $44,000 per mile, comparedwith $72,000 per mile for guardrail and $419,000per mile for concrete barriers. Furthermore, cablebarriers tend to snag tractor-trailer rigs, keepingthem from ricocheting back into same-directiontraffic. The state of Ohio spent $4.97 million installing113 miles of cable barriers. Answer the following using both tabulated factors and aspreadsheet function.(a) If the cable barriers prevent accidents totaling$1.3 million per year, what rate of return doesthis represent over a 10-year study period?(b) What is the rate of return for 113 miles ofguardrail if accident prevention is $1.1millionper year over a 10-year study period?
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